The difference between front-surface and rear-surface energy deposition of a 35 ps laser pulse (λ=1064 nm) in fused silica was investigated using shadowgraphic and laser-deflection techniques. Shock waves were observed in the glass and in air. Shock waves generated in air at the front surface are stronger than at the rear surface. Less than 35% of the energy incident on the surface drives the air shock waves at the rear surface. Up to 90% of the incident energy drives the air shock waves at the front surface. Laser-plasma interaction is responsible for this difference and for limiting the amount of energy deposited inside the sample during front-surface ablation. Energy deposition at the rear surface is mostly limited by self-focusing inside the material.
AD -Univ Calif Lawrence Livermore Natl Lab, Natl Ignit Facil, Livermore, CA 94550 USA Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
BT - Applied Physics Letters C2 - LBNL-51235 DA - 02/2001 DO - 10.1063/1.1362332 IS - 19 LA - eng LB - Laser N2 -The difference between front-surface and rear-surface energy deposition of a 35 ps laser pulse (λ=1064 nm) in fused silica was investigated using shadowgraphic and laser-deflection techniques. Shock waves were observed in the glass and in air. Shock waves generated in air at the front surface are stronger than at the rear surface. Less than 35% of the energy incident on the surface drives the air shock waves at the rear surface. Up to 90% of the incident energy drives the air shock waves at the front surface. Laser-plasma interaction is responsible for this difference and for limiting the amount of energy deposited inside the sample during front-surface ablation. Energy deposition at the rear surface is mostly limited by self-focusing inside the material.
PY - 2001 SP - 2840 EP - 2842 T2 - Applied Physics Letters TI - Energy deposition at front and rear surfaces during picosecond laser interaction with fused silica VL - 78 ER -